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| DTMF DIALER FOR BINARY DATA-IN S5T0167 INTRODUCTION 14-DIP-300 The S5T0167 is a DTMF dialer for 4 bit binary data input from the microprocessor. When the tone enable input is low, the oscillator is inhibited and the device is in a low power consumption at standby mode.On the low to high transition of tone enable, data is latched into the device and selected the standard DTMF signals. The N-channel open drain output provides a MUTE output during tone generation. FEATURES * * * * * * * Direct interface with microprocessor Generates 16 standard tones Uses inexpensive TV crystal or ceramic resonator (3.579545MHz) Very low total harmonic distortion Low power standby mode Binary data inputs with latches Wide Operating Voltage : 2.5 ~ 8.0V 14-SOP-225B ORDERING INFORMATION Device S5T0167X01-D0B0 S5T0167X01-S0B0 Package 14-DIP-300 14-SOP-225B Operating Temperature - 30 to +70C 1 S5T0167 DTMF DIALER FOR BINARY DATA-IN BLOCK DIAGRAM VDD MUTE OSC IN OSC OSC OUT MUTE LOGIC TEN ST GS D0 D1 D2 D3 DATA LATCH & DECODER 4 D/A CONVERTER & MIXING CONTROL CIRCUIT ROW & COLUMN TONE COUNTER TONE OUT VSS PIN CONFIGURATION VDD TEN ST GS VSS OSC IN OSC OUT 1 2 3 4 5 6 7 S5T0167 14 13 12 11 10 9 8 TONE OUT NC D3 D2 D1 D0 MUTE 2 DTMF DIALER FOR BINARY DATA-IN S5T0167 PIN DESCRIPTION Pin No 1 2 Symbol VDD TEN Positive supply input Tone enable input. An internal pull-up resistor is in a chip. When this pin connects to logic low, the oscillator is inhibited and the tone generators and output transistor are turned off. A low to high transition on this pin latches in data from D0 ~ D3, and tone generation continues until this pin is connected low again. Single tone enable. An internal pull-up resistor is in a chip. When this pin connects to logic low, the device is in a single tone mode. For normal operation, connects this pin to VDD or open-circuit. Group selection input. This pin is used to select the high group or low group frequency, when the device is in single tone mode. An internal pull-up resistor is in a chip. When this pin connects to VDD or open, the high group will be generated, and when connects to VSS, the low group will be generated. Negative supply input Oscillator input Descriptions 3 ST 4 GS 5 6 7 8 VSS OSC IN OSC OUT Oscillator output MUTE N-channel open drain output. This pin is a logic high state, when the tone enable pin is a high state. This pin goes a logic low state, when the tone enable pin is a low state. DATA-INPUTS. These are the inputs for binary-coded data, which is latched in on the rising edge of the tone enable signal. No connection. This output is the open emitter of a NPN transistor. When an external load resistor is connected from this pin to VSS, the tone generates on the tone enable pin = High. 9, 10, 11, 12 13 14 D0, D1, D2, D3 N.C Tone out ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage MUTE Voltage Input Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VDD VI (MUTE) VI PD TOPR TSTG Value 9 9 VDD + 0.3 to VSS - 0.3 500 - 30 to + 70 - 55 to + 125 Unit V V V mW C C 3 S5T0167 DTMF DIALER FOR BINARY DATA-IN ELECTRICAL CHARACTERISTICS (VSS = 0V, 2V FUNCTION DESCRIPTION When tone enable input is low, oscillator is inhibited, being allowed to low power standby mode since transistor goes to turn off state, so D0 to D3 input data is ignored. However if tone enable input goes from low to high, input data is latched and tone output is enabled, and it is correspond to data input. This device is designed with 14 levels, 28 segments in each single-tone. The column tone is pre-emphasized 2dB than the row tone. Table 1. Single Tone Frequency Tone Group Standard DTMF (Hz) Tone Output Actual Frequency ROW 1 ROW 2 ROW 3 ROW 4 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 697 770 852 941 1209 1336 1477 1633 699.13 766.17 845.43 947.97 1215.89 1331.67 1471.85 1645.01 % Deviation from Standard + 0.31 - 0.50 - 0.54 + 0.74 + 0.57 - 0.33 - 0.35 + 0.75 4 DTMF DIALER FOR BINARY DATA-IN S5T0167 Table 2. Function Table Key Board Equivalent 1 2 3 4 5 6 7 8 9 0 * # A B C D D3 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 Data Input D2 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 D1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 D0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Tone Output fL (Hz) 697 697 697 770 770 770 852 852 852 941 941 941 697 770 852 941 fH (Hz) 1209 1336 1477 1209 1336 1477 1209 1336 1477 1336 1209 1477 1633 1633 1633 1633 5 S5T0167 DTMF DIALER FOR BINARY DATA-IN NOTES 6 |
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